Can't add Facebook account to Google Calendar on N7

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Hi guys
Having some difficulty adding my Facebook account to my Google Calendar on my stock N7. I don't wish to root it as I have an app called Sky Go which will not work on rooted devices. For some reason when I go the Add Account option in Calendar Settings, all I see are Corporate, Sky Go and Google. Ideas most welcome please as it is driving me nuts.
N.B. My Facebook account is added and set to sync in the main settings and am using the F/B app.
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